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CN103409706A - Steel sheet for high-strength container - Google Patents

Steel sheet for high-strength container Download PDF

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Publication number
CN103409706A
CN103409706A CN2013102960222A CN201310296022A CN103409706A CN 103409706 A CN103409706 A CN 103409706A CN 2013102960222 A CN2013102960222 A CN 2013102960222A CN 201310296022 A CN201310296022 A CN 201310296022A CN 103409706 A CN103409706 A CN 103409706A
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China
Prior art keywords
rolling
steel
carbide
following
steel sheet
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Granted
Application number
CN2013102960222A
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Chinese (zh)
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CN103409706B (en
Inventor
加藤寿胜
荒古诚
河村胜人
小岛克己
佐藤觉
筋田成子
青木文男
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

A steel sheet for containers that has a hardness of 500 MPa or more and superior workability and a method for producing the steel sheet are provided. A steel containing, in percent by mass, 0.01% to 0.05% carbon, 0.04% or less silicon, 0.1% to 1.2% manganese, 0.10% or less sulfur, 0.001% to 0.100% aluminum, 0.10% or less nitrogen, and 0.0020% to 0.100% phosphorus, the balance being iron and incidental impurities, is subjected to hot rolling at a finishing temperature of (Ar3 transformation temperatute-30) DEG C or more and a coiling temperature of 400 DEG C to 750 DEG C, is subjected to pickling and cold rolling, is subjected to continuous annealing including overaging treatment, and is subjected to second cold rolling at a reduction rate of 20% to 50%, thus providing a high-strength steel sheet for containers that has a tensile strength of 500 MPa or more and a proof stress difference between width and rolling directions of 20 MPa or less.

Description

Steel sheet for high-strength container
The application is to be that April 10, application number in 2009 are that the 200980112785.9(international application no is PCT/JP2009/057717 the applying date), denomination of invention divides an application for the application for a patent for invention of " steel sheet for high-strength container and manufacture method thereof ".
Technical field
The present invention relates to be suitable as and after welding waits two processing such as three processing or DI, carry out dwindling or enlarging the container processed steel sheet for high-strength container and the manufacture method thereof with former material of diameter shape.
Background technology
In recent years, in order reducing costs, and to utilize material and alleviate carrying capacity of environment in order to reduce, carrying out the goods exploitation be used to the goods thickness of slab attenuation that makes the steel (steel plate) as former material.
In addition, if, owing to making rigidity reduction of goods thickness of slab attenuation, therefore in order to make up this rigidity, reduce, also need to seek the high strength of steel.But, when seeking the high strength of steel, due to hardening, therefore have the problem cracked in flange processing or necking down processing.
For above-mentioned situation, various manufacture method have been proposed at present.
For example, following method has been proposed in patent documentation 1: by Composition Control in steel within the specific limits, and at (Ar 3Transformation temperature-30 ℃) abovely finish hot rolling, then carry out pickling, cold rolling after, carry out continuous annealing, then carry out 2 times cold rolling.
But, in the method for patent documentation 1, due in order not make flange processibility, necking down processibility and erosion resistance variation make P below 0.02 % by weight, and to make 2 cold rolling rolling rates be 15～30%, therefore be difficult to effectively thin goods be processed, thereby be difficult to produce, and have the problem that bad order easily occurs.And also there are the following problems: sometimes on the steel billet top layer, crack, and become the reason of the yield rate reduction of goods.And, be difficult to stably manufacture, thereby need to improve.
In addition, the representational manufacture method as the steel plate for container of hard, proposed following method, can for example, according to annealing kind choice for use (non-patent literature 1) suitably.
Hot rolling → pickling → cold rolling → bell-type annealing (BAF) → 2nd time cold rolling (rolling rate: 20～50%)
Hot rolling → pickling → cold rolling → continuous annealing (CAF) → 2nd time cold rolling (rolling rate: 20～50%)
But, in aforesaid method, because the oilness when improving rolling has been used the various ROLLING OIL that viscosity is high, therefore exist concentration deviation, part oil by ROLLING OIL to adhere to the problem of bad order after the rolling caused.And in the situation that the rolling rate is high, steel plate is because rolling is stretched, so the poor increase of the endurance of the width of steel plate and rolling direction.
To this, can consider the method that suppresses the 2nd cold rolling rolling rate lower.But, in the situation that reduce the rolling rate, be difficult to obtain needed endurance.
Patent documentation 1: No. 3108615 communique of Japanese Patent
Non-patent literature 1: " わ Ga state To お け Ru narrow-necked earthen jar surface treatment Steel plate skill Intraoperative history ", Japanese iron and steel institute, put down into distribution on October 30th, 10, p.188
As mentioned above, in the situation that hope obtains the steel plate for container of sheet thickness, there is no to meet simultaneously the manufacture method of intensity, processibility and productivity, thereby present situation is to expect such manufacture method.
The present invention In view of the foregoing completes, and its purpose is, provides that to have tensile strength TS be the above intensity of 500MPa, and the endurance of plate width direction and rolling direction poor be below 20MPa, and the steel plate for container of excellent processability and manufacture method thereof.
Summary of the invention
The inventor has carried out wholwe-hearted research in order to address the above problem.Its result obtains following opinion.
The contriver finds, by adjusting the P content be grouped into as one-tenth, and the rate of being rolled is 20～50% the 2nd the cold rolling high strength that carries out, and then when continuous annealing, carry out the overaging processing, carbide is separated out equably, and the site of this carbide as the stress dispersion that makes to add man-hour is used, not only outward appearance is uncomfortable thus reduces, and the endurance of width and rolling direction is poor diminishes, can guarantee high-intensity material.But also find, particle diameter, density, ratio by stipulating above-mentioned carbide, can access the steel plate for container that processibility is better.
As mentioned above, in the present invention, by based on above-mentioned opinion control composition, completed high-strength metal sheet for use in cans.
The present invention is based on above opinion and complete, its purport is as follows.
[1] a kind of steel sheet for high-strength container, it is in quality %, contain that C:0.01～0.05%, Si:0.04% are following, Mn:0.1～1.2%, S:0.10% are following, Al:0.001～0.100%, N:0.10% are following, P:0.0020～0.100%, surplus consists of Fe and inevitable impurity, tensile strength TS is more than 500MPa, and the endurance of plate width direction and rolling direction poor be below 20MPa.
[2] a kind of steel sheet for high-strength container, it is in quality %, contain that C:0.01～0.05%, Si:0.04% are following, Mn:0.1～1.2%, S:0.10% are following, Al:0.001～0.100%, N:0.10% are following, P:0.0020～0.020%, surplus consists of Fe and inevitable impurity, tensile strength TS is more than 500MPa, and the endurance of plate width direction and rolling direction poor be below 20MPa.
[3] a kind of manufacture method of steel sheet for high-strength container, is characterized in that, is (Ar in finishing temperature 3Phase point temperature-30) ℃ more than, coiling temperature is, under 400～750 ℃, steel is carried out to hot rolling, and carried out pickling, cold rolling after, comprise the continuous annealing that overaging is processed, then, with 20～50% rolling rate carry out the 2nd time cold rolling, described steel is in quality %, contain that C:0.01～0.05%, Si:0.04% are following, Mn:0.1～1.2%, S:0.10% are following, Al:0.001～0.100%, N:0.10% are following, P:0.0020～0.100%, surplus consists of Fe and inevitable impurity.
[4] a kind of manufacture method of steel sheet for high-strength container, is characterized in that, is (Ar in finishing temperature 3Phase point temperature-30) ℃ more than, coiling temperature is, under 400～750 ℃, steel is carried out to hot rolling, and carried out pickling, cold rolling after, comprise the continuous annealing that overaging is processed, then, with 20～50% rolling rate carry out the 2nd time cold rolling, described steel is in quality %, contain that C:0.01～0.05%, Si:0.04% are following, Mn:0.1～1.2%, S:0.10% are following, Al:0.001～0.100%, N:0.10% are following, P:0.0020～0.020%, surplus consists of Fe and inevitable impurity.
In addition, in this manual, mean that the % of the composition of steel is quality %.And in the present invention, " steel sheet for high-strength container " refers to that tensile strength TS (below, sometimes be called for short TS) is the above steel plate for container of 500MPa.
And steel sheet for high-strength container of the present invention be take container and with former material, is object with former material, tank.No matter have or not surface treatment, all can implement zinc-plated, nickel plating tin, chromium plating (plating of so-called Wuxi) or organic coating etc., can be applied in the purposes of extremely wide scope.
And, although thickness of slab is not particularly limited, from maximally utilising the present invention, obtaining the viewpoint of effect, thickness of slab is preferably below 0.30mm, more preferably below 0.20mm.Be particularly preferably below 0.170mm.
Embodiment
Below, the present invention is described in detail.
Steel plate for container of the present invention is that TS is that 500MPa is above, plate width direction and the endurance of rolling direction are poor is the steel sheet for high-strength container below 20MPa.And in the present invention, by adjusting P content, and the rolling rate while making the 2nd time cold rolling (below, sometimes cold rolling also referred to as 2 times) is 20～50%, and high-intensity steel plate for container can be provided.
The one-tenth of steel plate for container of the present invention is grouped into and describes.
C：0.01～0.05%
If the C composition makes 2 steel plate hardenings after cold rolling to more than needing at most, make tank processed, necking down processibility variation.And, become and at flange, add the element that HAZ is cracked because of the significant hardening of weld part.If C surpasses 0.05%, these impacts become significantly, and therefore making C is below 0.05%.On the other hand, extremely low if the C composition becomes, for the intensity that maintains container, need to implement the secondary cold-rolling of high rolling rate, therefore making C is more than 0.01%, is preferably more than 0.02% and below 0.04%, more preferably more than 0.02% and below 0.03%.
Below Si:0.04%
If add in a large number Si, produce the variation of surface texture, the variation of erosion resistance.Therefore, making Si is below 0.04%.
Mn：0.1～1.2%
Mn is to preventing the effective element of the hot tearing caused by S.And, by according to the S amount, adding, can be prevented the effect of crackle.And, also have the effect that makes the crystal grain miniaturization.In order to bring into play these effects, need to add at least the Mn more than 0.1%.On the other hand, add if a large amount of, demonstrate the tendency of erosion resistance variation, and make the steel plate hardening to more than needing, thereby make flange processibility, necking down processibility variation, therefore make on it to be limited to 1.2%.Be preferably below 0.35%.
P：0.0020～0.100%
P is the composition that makes the steel hardening, in the present invention, according to needed intensity, contains the P of predetermined amount.If be less than 0.0020%, can not obtain the above TS of 500MPa, therefore making P content is more than 0.0020%.On the other hand, contain excessive P composition and when above, make the erosion resistance variation to needs.And, make flange processibility, necking down processibility variation.If P content surpasses 0.100%, the problems referred to above become significantly, therefore make on it to be limited to 0.100%.When P content is 0.0020～0.020%, by adding suitable intensity that P brings and the effect of secondary cold-rolling described later, can access higher intensity, therefore preferably.
Below S:0.10%
S form with inclusion in steel exists, and is the element that makes the ductility reduction of steel plate and then make the erosion resistance variation.Therefore, be below 0.10%.Be preferably below 0.030%.
Al：0.001～0.100%
Al is the necessary element of the deoxidation of steel.If it is insufficient that its amount is less than 0.001% deoxidation, cause the variation of the flange processibility that inclusion causes, the variation of necking down processibility.Therefore, be more than 0.001%.On the other hand, Al is combined with the N composition, solid solution N is reduced, if but the excessive minimizing of solid solution N can not obtain required intensity.Therefore, making Al content is below 0.100%.Be preferably 0.035～0.075%.
Below N:0.10%
N can not cause the hardness of weld part to rise and to improving the useful element of intensity.But if content is crossed the remarkable hardening of steel plate at most, the danger that cracks defect on the former material of rolling (steel billet) enlarges markedly, otherwise make flange processibility, necking down processibility variation.Therefore, making N is below 0.10%.Preferably be below 0.05%.And, from preventing the viewpoint of crackle of steel billet, more preferably make N be less than 0.01%.More preferably below 0.005%.As mentioned above, by reducing N, can reduce crackle of steel billet, thereby can not need the steel billet finishing and yield rate is improved.
Surplus is Fe and inevitable impurity.
Surplus beyond mentioned component is Fe and inevitable impurity.In addition, as inevitable impurity, for example can allow below Sn:0.01%.
Steel plate for container of the present invention has above-mentioned composition, and has the above TS of 500MPa, and the endurance of plate width direction and rolling direction is poor is below 20MPa.Due to the TS had more than 500MPa, even therefore thickness of slab attenuation rigidity does not still reduce.And because the endurance that makes plate width direction and rolling direction is poor for below 20MPa, so flange processing, necking down add and can not crack man-hour.
Below, the manufacture method of steel sheet for high-strength container of the present invention is described.
Generally well-known melting method by having used converter etc., by the molten steel of above-mentioned composition, then, is made the former material of rolling (steel billet) by generally well-known castmethods such as continuous metal cast processs.Then, use the former material of these rollings, make hot-rolled sheet by hot rolling.
Steel billet is extracted temperature out: 1050～1300 ℃ (optimum condition)
If making the extraction temperature of steel billet is more than 1050 ℃,, in the hot rolling of subsequent processing, can fully guarantee high hot rolling end temp.On the other hand, if make, extracting temperature out is below 1300 ℃, and the surface texture of steel plate does not finally have variation.Therefore, steel billet is extracted temperature out and is preferably more than 1050 ℃ and below 1300 ℃.
Finishing temperature (hot rolling end temp): (Ar 3Phase point temperature-30) ℃ more than
For cold-rolling property and the article characteristic that makes subsequent handling reaches well, need to make the hot rolling end temp is (Ar 3Phase point temperature-30) ℃ more than.If lower than (Ar 3Phase point temperature-30) ℃, the metal structure coarse of final goods, become during tank processed and easily produce uneven surface.In addition, if the hot rolling end temp is low temperature, produce the muscle phenomenon, easily produced the bad order after forming process.Therefore, making the hot rolling end temp is (Ar 3Phase point temperature-30) ℃ more than.
Coiling temperature: 400～750 ℃
If the shape variation of the too low hot-rolled sheet of coiling temperature, and then become the pickling of subsequent processing, the obstacle of cold rolling manipulation, therefore it is made as more than 400 ℃.On the other hand, if curling excess Temperature is separated out at hot rolling motherboard stage aluminium nitride, can not guarantee to strengthen required enough solid solution N thereby become.And, in the hot rolling motherboard, form the tissue that carbide is assembled, can not obtain the effect of evenly being separated out by the carbide that overaging described later causes, and this brings detrimentally affect for the erosion resistance of steel plate.And, follow the increase of the scale thickness of surface of steel plate generation, the pickling variation.For fear of these problems, need to make coiling temperature is below 750 ℃.
The hot-rolled sheet of as above manufacturing is carried out to pickling, cold rolling, make cold-reduced sheet.Pickling is as long as remove surface scale according to well-established law with acid such as hydrochloric acid, sulfuric acid.
(after pickling) cold rolling rolling rate: more than 80% (optimum condition)
If the rolling rate is less than 80%, the abundant grain refined that sometimes can not obtain organizing after annealing, therefore be preferably more than 80%.In addition, in the steel plate of the former material that the present invention is such, for the abundant miniaturization that realizes organizing, the rolling rate is more preferably more than 85%.On the other hand, do not need the upper limit of rolling rate is particularly limited, can consider that the ability etc. of hot rolling, cold rolling equipment group is suitably set.
Annealing temperature: the recrystallization temperature below 800 ℃ (optimum condition)
If remaining non-recrystallization tissue in steel plate, the plasticity while causing tank processed is bad, bad order etc., therefore need to implement recrystallize by continuous annealing and process.But, if excessively improve annealing temperature, when continuous annealing, produce the defects such as thermal flexure or plate fracture.And the crystal grain growth due to abnormal, cause the danger of appearance characteristics variation to increase.Therefore, preferably in being the recrystallization temperature scope below 800 ℃, annealing temperature carries out.
And, as long as in this temperature range, just do not need specially to keep constant temp.From the stability of operation, 5s soaking equivalent time above and that 60s is following is fully.If the soaking time that 5s is above, the separating out of carbide that forms the site of the stress dispersion that makes to add man-hour becomes fully, therefore preferably.
Overaging is processed
In order to make the carbide of separating out by above-mentioned annealing further disperse equably and effectively form the stress dispersion site, need to carry out the overaging processing.The overaging processing is preferably after above-mentioned annealing, and the speed of cooling above with 10 ℃/s is cooled to the temperature range of 300～500 ℃, and more than the temperature range maintenance 5s of 300～500 ℃.By with the above speed of cooling of 10 ℃/s, being cooled to the temperature range of 300～500 ℃, carbide becomes and easily separates out, if, more than in the temperature range of 300～500 ℃, keeping 5s, can guarantee separating out of uniform carbide.And, by carrying out such overaging, process, though under 20～50% rolling rate, carry out shown below the 2nd time cold rolling, still can make the endurance of plate width direction and rolling direction poor is below 20MPa.By under such condition, carrying out the overaging processing, can make particle diameter is that density and the ratio that the following and particle diameter of 1.5 μ m is greater than 1.5 μ m and the carbide below 3.0 μ m is preferable range described later.
The 2nd cold rolling rolling rate: 20～50% (preferably 20～30%)
In order to ensure the compressive strength of welded tank, be the yield strength of steel plate, need after continuous annealing the 2nd time cold rolling (below, be sometimes referred to as 2 times cold rolling).Particularly, use the situation of having adjusted the former material of P content of the present invention if consider, need to make 2 cold rolling rolling rates to be at least 20%.On the other hand, if the rolling rate surpasses 50%, the anisotropy of material characteristic increases, the poor 20MPa that surpasses of the endurance of plate width direction and rolling (rolling) direction.And, make flange processibility, the remarkable variation of necking down processibility in new plate preparation method (the plate preparation method that the rolling direction of steel plate is parallel with the direction of principal axis of can body).And, the welding during due to tank processed, the burst size of strain increases, and the softening of welding heat affected zone becomes significantly, thereby the easily generation flange crack that becomes.Therefore, the rolling rate is made as below 50%.Be preferably more than 20% and below 30%, but also can suitably select as the armor plate strength of target according to take P content.Particularly, preferably at P content, be greater than 0.020% and in the high-content situation below 0.100%, be made as lower rolling rate.
In the present invention, can 2 times cold rolling after, above on the surface (at least one surface) of cold-rolled steel sheet form coating, thereby make Coated Steel.The coating formed on surface can adopt any materials that is applied to steel plate for container.As coating, can illustration zinc-plated, chromium plating, nickel plating, nickel plating chromium.And, after processing, above-mentioned plating carries out application, stickup organic resin film etc. also without any problem.
Embodiment
By converter, will contain the composition shown in table 1, surplus by the steel melting that Fe and inevitable impurity form, make steel billet by continuous metal cast process.Then, making steel billet extract temperature out is that 1200 ℃, hot rolling finishing temperature are that 900 ℃, coiling temperature are 650 ℃, and above-mentioned steel billet is implemented to hot rolling, makes the hot-rolled sheet that final thickness is 2.0mm.Then, to these hot-rolled sheets, implement to utilize the de-scale of pickling to process, then implement the rolling rate and be 90% cold rolling, make the cold-reduced sheet that final thickness is 0.20mm, then, continuous annealing, the overaging of carrying out soaking temperature and be 750 ℃, soaking time and be 10～30s process and 2 times cold rolling, make cold-rolled steel sheet.
In addition, overaging treatment condition and 2 cold rolling rolling rates are as shown in table 2 and table 3.
Table 1
Figure BDA00003511932600101
Utilize following method, the steel plate as above obtained is carried out to structure observation, obtain density and the ratio of carbide particle diameter.And, carry out following test, characteristic is estimated.The cold-rolled steel sheet as above obtained is imbedded to resol (bakelite), and grind cross section.Then, use to mix picric acid, sodium hydroxide and the sodium picrate solution that obtains as corrosive fluid, under 80 ℃, the condition of 60s, be implemented in the dip treating in corrosive fluid.Then, by the opticmicroscope of 400 times, in 3 visuals field (scope of about 0.1375mm * 0.1375mm), carbide is observed.In each visual field, by visual, obtain that particle diameter 1.5 μ m are following, particle diameter is greater than 1.5 μ m and below 3.0 μ m, particle diameter is greater than the number of the carbide of 3.0 μ m, and obtains the mean value of density and the ratio in 3 visuals field.Now, the particle diameter of carbide is minimum diameter, and for example, carbide shape is rectangle or oval while having minor axis and major diameter, and the minimum diameter of take in the present invention is particle diameter.
(i) tension test
From the central part of the width of these cold-rolled steel sheets, cut No. JIS13-B tension test sheet along rolling (L) direction, implement tension test with the rate of straining pinblock speed of 10mm/s, measure tensile strength TS and yield strength YS.In addition, tension test after goods 1 day with interior enforcement.It is in order to reduce the phenomenon of fracture outside gauge length as far as possible that the tension test sheet is made as to No. JIS13-B test film.
(ii) endurance of plate width direction and rolling direction is poor
Obtain YS that the stretching test measurement by above-mentioned (i) obtains, and to No. JIS13-B tension test sheet cutting on plate width direction and (i) similarly measure poor between the YS obtained.
(iii) necking down processibility
These cold-rolled steel sheets are plated to Sn and process (the Sn adhesion amount of single face is 2.8g/m2), make Coated Steel.After application/printing/transparent varnish processing is carried out on the surface of this Coated Steel, do not use punching oil and under following condition, above-mentioned steel plate is carried out to 100 deep drawing moulding, this deep drawing moulding refers to be implemented the cup pull and stretch and then implements 2 pull and stretch processing again, the production rate of the pull and stretch fold of research eck.
The deep drawing condition of molding
Lip diameter: 200mm Φ
Lubricating condition: do not use punching oil
The pull and stretch ratio of the 1st pull and stretch: 1.5
The pull and stretch ratio of the 2nd pull and stretch: 1.2
The pull and stretch ratio of the 3rd pull and stretch: 1.2
The wrinkle resistant pressure of 1st～3 pull and stretch: optimum condition
Flange processing: elongation 8%
Drawing Die angular radius: 0.45mm again
Process velocity: 0.3m/s
(iv) anti-flange crack
In the deep drawing moulding of (iii), the production rate of research flange crack.
(v) outward appearance
These cold-rolled steel sheets of visual observation, will be judged as gloss or the color distinct portions is made as bad order.If in observed 100m unit, find 1 place's bad order, this 100m is made as to bad order section, observe 10000m and obtain the bad order rate.
(vi) crackle of steel billet
The situation of the crackle of steel billet by the billet surface after the visual observation continuous casting.
If in observed 1m unit, find 1 place's crackle, this 1m is made as to bad order, observe 10m and obtain the bad order rate.
The result of gained and condition together are shown in to table 2 and table 3.
Table 2
Figure BDA00003511932600131
Table 3
By table 2 and table 3, can be confirmed, inventive example No.8～10,13～18,26～28,31～36 have sufficient intensity, and the endurance of plate width direction and rolling direction poor be below 20MPa, for example, be enough to reach three processing needed performances.And good appearance, do not produce eck fold and flange crack.And as can be known, the processibility that the density of carbide, ratio are in the No.8 of preferable range～10,13～15,26～28,31～33 is better.
On the other hand, the rolling rate of comparative example No.1,2,19,20 secondary cold-rolling of not carrying out the overaging processing is low, can not obtain intensity.The rolling rate of No.3～5,21～23 secondary cold-rolling is that more than 20%, intensity increases, but the poor 20MPa that surpasses of the endurance of L direction and C direction, the generation of eck fold, flange crack is remarkable.And, produce bad order.
In addition, the rolling rate of secondary cold-rolling is less than 20% No.6,7,11,12,24,25,29,30 and can not obtains intensity.
And density, ratio about carbide, obtain following opinion.Steel sheet for high-strength container of the present invention, from the viewpoint of processibility, preferable particle size is that the density of the following carbide of 1.5 μ m is greater than 102/10000 μ m 2, and the density that particle diameter is greater than 1.5 μ m and the carbide below 3.0 μ m is greater than 63/10000 μ m 2.And to be the following carbide number of 1.5 μ m be greater than 52% with respect to the ratio of the total number of carbide to preferable particle size, and to be the following carbide number of 3.0 μ m be greater than 85% with respect to the ratio of the total number of carbide to particle diameter.
Particle diameter is that the density of the following carbide of 1.5 μ m is greater than 102/10000 μ m 2, and the density that particle diameter is greater than 1.5 μ m and the carbide below 3.0 μ m is greater than 63/10000 μ m 2, can guarantee thus the enough carbide of man-hour as stress dispersion site performance function that add, it is better that processibility becomes.More preferably, particle diameter is that the density of the following carbide of 1.5 μ m is 130/10000 μ m 2Above, the density that particle diameter is greater than 1.5 μ m and the carbide below 3.0 μ m is 80/10000 μ m 2Above.
And, if the particle diameter carbide number that to be 1.5 μ m following is greater than 52% with respect to the ratio of the total number of carbide, and, to be the following carbide number of 3.0 μ m be greater than 85% with respect to the ratio of the total number of carbide to particle diameter, the effect as the carbide of stress dispersion site performance function further improves, and processibility is further improved.More preferably, particle diameter is the following carbide number of 1.5 μ m is more than 55% with respect to the ratio of the total number of carbide, and particle diameter is the following carbide number of 3.0 μ m is more than 90% with respect to the ratio of the total number of carbide.
And the density of above-mentioned carbide and ratio, can control by under the condition predetermined, steel plate after cold rolling being carried out to anneal.Particularly, in the continuous annealing operation after cold rolling, carry out the overaging processing after being adjusted to the thermal history of steel plate in pre-determined range.
And table 3 is to make N content be 0.0065%, 0.0043%, namely be less than the embodiment of 0.01% preferable range.As shown in Table 3, be less than 0.01% by making N content, do not find to have prevented the crackle of steel billet generation by crackle of steel billet fully.
According to the present invention, can access and have the above TS of 500MPa, the endurance of plate width direction and rolling direction is poor is below 20MPa, and processes and necking down adds the steel sheet for high-strength container of the excellent processability do not cracked man-hour at flange.
And in the present invention, by adjusting P content, and to make the 2nd cold rolling rolling rate be 20～50% to carry out high strength, solved the poor problem of endurance of the problem of appearance after the rolling, width and rolling direction.
In addition, by making the N composition, be to be less than 0.01% preferable range, can prevent crackle of steel billet, the yield rate that suppresses goods reduces.
On industry, utilize possibility
Steel plate for container of the present invention, in the processing of necking down processing or flange, do not crack and can access good intensity, therefore can be suitable as such as take the container as representative such as electronic units such as non-food product container, battery such as food product containers, purolator such as tank and use with former material.

Claims (2)

1. steel sheet for high-strength container, it is in quality %, contain that C:0.01～0.05%, Si:0.04% are following, Mn:0.1～1.2%, S:0.10% are following, Al:0.001～0.100%, N:0.10% are following, P:0.0020～0.100%, surplus consists of Fe and inevitable impurity, and in steel plate, particle diameter is that the density of the following carbide of 1.5 μ m is greater than 102/10000 μ m 2, the density that particle diameter is greater than 1.5 μ m and the carbide below 3.0 μ m is greater than 63/10000 μ m 2, tensile strength TS is more than 500MPa, and the endurance of plate width direction and rolling direction poor be below 20MPa.
2. steel sheet for high-strength container, it is in quality %, contain that C:0.01～0.05%, Si:0.04% are following, Mn:0.1～1.2%, S:0.10% are following, Al:0.001～0.100%, N:0.10% are following, P:0.0020～0.020%, surplus consists of Fe and inevitable impurity, and in steel plate, particle diameter is that the density of the following carbide of 1.5 μ m is greater than 102/10000 μ m 2, the density that particle diameter is greater than 1.5 μ m and the carbide below 3.0 μ m is greater than 63/10000 μ m 2, tensile strength TS is more than 500MPa, and the endurance of plate width direction and rolling direction poor be below 20MPa.
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